| 1 | /** |
| 2 | * Copyright (C) 2011-2012 Juho Vähä-Herttua |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | #include <assert.h> |
| 18 | |
| 19 | #include "compat.h" |
| 20 | |
| 21 | int |
| 22 | netutils_init() |
| 23 | { |
| 24 | #ifdef WIN32 |
| 25 | WORD wVersionRequested; |
| 26 | WSADATA wsaData; |
| 27 | int ret; |
| 28 | |
| 29 | wVersionRequested = MAKEWORD(2, 2); |
| 30 | ret = WSAStartup(wVersionRequested, &wsaData); |
| 31 | if (ret) { |
| 32 | return -1; |
| 33 | } |
| 34 | |
| 35 | if (LOBYTE(wsaData.wVersion) != 2 || |
| 36 | HIBYTE(wsaData.wVersion) != 2) { |
| 37 | /* Version mismatch, requested version not found */ |
| 38 | return -1; |
| 39 | } |
| 40 | #endif |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | void |
| 45 | netutils_cleanup() |
| 46 | { |
| 47 | #ifdef WIN32 |
| 48 | WSACleanup(); |
| 49 | #endif |
| 50 | } |
| 51 | |
| 52 | int |
| 53 | netutils_init_socket(unsigned short *port, int use_ipv6, int use_udp) |
| 54 | { |
| 55 | int family = use_ipv6 ? AF_INET6 : AF_INET; |
| 56 | int type = use_udp ? SOCK_DGRAM : SOCK_STREAM; |
| 57 | int proto = use_udp ? IPPROTO_UDP : IPPROTO_TCP; |
| 58 | |
| 59 | struct sockaddr_storage saddr; |
| 60 | socklen_t socklen; |
| 61 | int server_fd; |
| 62 | int ret; |
| 63 | |
| 64 | assert(port); |
| 65 | |
| 66 | server_fd = socket(family, type, proto); |
| 67 | if (server_fd == -1) { |
| 68 | goto cleanup; |
| 69 | } |
| 70 | |
| 71 | memset(&saddr, 0, sizeof(saddr)); |
| 72 | if (use_ipv6) { |
| 73 | struct sockaddr_in6 *sin6ptr = (struct sockaddr_in6 *)&saddr; |
| 74 | |
| 75 | /* Initialize sockaddr for bind */ |
| 76 | sin6ptr->sin6_family = family; |
| 77 | sin6ptr->sin6_addr = in6addr_any; |
| 78 | sin6ptr->sin6_port = htons(*port); |
| 79 | |
| 80 | socklen = sizeof(*sin6ptr); |
| 81 | ret = bind(server_fd, (struct sockaddr *)sin6ptr, socklen); |
| 82 | if (ret == -1) { |
| 83 | goto cleanup; |
| 84 | } |
| 85 | |
| 86 | ret = getsockname(server_fd, (struct sockaddr *)sin6ptr, &socklen); |
| 87 | if (ret == -1) { |
| 88 | goto cleanup; |
| 89 | } |
| 90 | *port = ntohs(sin6ptr->sin6_port); |
| 91 | } else { |
| 92 | struct sockaddr_in *sinptr = (struct sockaddr_in *)&saddr; |
| 93 | |
| 94 | /* Initialize sockaddr for bind */ |
| 95 | sinptr->sin_family = family; |
| 96 | sinptr->sin_addr.s_addr = INADDR_ANY; |
| 97 | sinptr->sin_port = htons(*port); |
| 98 | |
| 99 | socklen = sizeof(*sinptr); |
| 100 | ret = bind(server_fd, (struct sockaddr *)sinptr, socklen); |
| 101 | if (ret == -1) { |
| 102 | goto cleanup; |
| 103 | } |
| 104 | |
| 105 | ret = getsockname(server_fd, (struct sockaddr *)sinptr, &socklen); |
| 106 | if (ret == -1) { |
| 107 | goto cleanup; |
| 108 | } |
| 109 | *port = ntohs(sinptr->sin_port); |
| 110 | } |
| 111 | return server_fd; |
| 112 | |
| 113 | cleanup: |
| 114 | ret = SOCKET_GET_ERROR(); |
| 115 | if (server_fd != -1) { |
| 116 | closesocket(server_fd); |
| 117 | } |
| 118 | SOCKET_SET_ERROR(ret); |
| 119 | return -1; |
| 120 | } |
| 121 | |
| 122 | unsigned char * |
| 123 | netutils_get_address(void *sockaddr, int *length) |
| 124 | { |
| 125 | unsigned char ipv4_prefix[] = { 0,0,0,0,0,0,0,0,0,0,255,255 }; |
| 126 | struct sockaddr *address = sockaddr; |
| 127 | |
| 128 | assert(address); |
| 129 | assert(length); |
| 130 | |
| 131 | if (address->sa_family == AF_INET) { |
| 132 | struct sockaddr_in *sin; |
| 133 | |
| 134 | sin = (struct sockaddr_in *)address; |
| 135 | *length = sizeof(sin->sin_addr.s_addr); |
| 136 | return (unsigned char *)&sin->sin_addr.s_addr; |
| 137 | } else if (address->sa_family == AF_INET6) { |
| 138 | struct sockaddr_in6 *sin6; |
| 139 | |
| 140 | sin6 = (struct sockaddr_in6 *)address; |
| 141 | if (!memcmp(sin6->sin6_addr.s6_addr, ipv4_prefix, 12)) { |
| 142 | /* Actually an embedded IPv4 address */ |
| 143 | *length = sizeof(sin6->sin6_addr.s6_addr)-12; |
| 144 | return (sin6->sin6_addr.s6_addr+12); |
| 145 | } |
| 146 | *length = sizeof(sin6->sin6_addr.s6_addr); |
| 147 | return sin6->sin6_addr.s6_addr; |
| 148 | } |
| 149 | |
| 150 | *length = 0; |
| 151 | return NULL; |
| 152 | } |
| 153 | |